Don't forget that :
- You must stay sneaked otherwise you're fucked up.
- You must reach the back of the guy or you're fucked up.
- The guy must not rotate or you're fucked up.
- If the guy survive, you're fucked up, as you are unsneaked and deliver 10 times less damage. (as sneak are not great warriors, it means dead)
So, in theory you are already a lot more nerfed than any other pvp char, that can be dangerous any time, at any sides, for a much bigger range.
So maybe the auto-crit could be changed in 80%-crit, but removing the feature is not, in my opinion, the right move, as it would break a lot of characters. (which are considerably long to px)